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<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var i=1;
        var sum=0;
        do{
            sum=sum+i;
            i++;
        }while(i<=100)
        document.write('1-100的和：'+sum);
    </script>
</body>
</html>